Polarization separating film and illumination apparatus for display device using the polarization separating film
a technology of polarizing film and illumination apparatus, which is applied in the direction of polarising elements, instruments, optics, etc., can solve the problems of high manufacturing cost, complex and costly manufacturing processes, and low light use efficiency, and achieve the effect of low cost and simple structur
Inactive Publication Date: 2008-05-01
SAMSUNG ELECTRONICS CO LTD
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Benefits of technology
The present invention provides a polarization separating film that can produce a polarized light with a simple structure and low cost. The film has an isotropic layer and an anisotropic layer with different refractive indices for different polarizations of light. The film also has micropatterns that change the optical path of incident light and transmit or reflect light of different polarizations. The film can be used in an illumination apparatus for a display device, improving the efficiency of light use. The apparatus includes a light source, a light guide plate, and the polarization separating film. The light guide plate may have a scattering pattern or a polarization conversion member, such as a ¼ wave plate or an anisotropic polymer film. The technical effects of the invention are improved light use efficiency and a simplified and cost-effective solution for producing polarized light.
Problems solved by technology
Such low light use efficiency results from light absorption by an absorption type polarization plate and a color filter used in liquid crystal display devices.
However, the related art polarization separating film is manufactured by depositing, stacking, and elongating hundreds layers of polymers or by forming of a film coated in a thin film multilayer through vacuum deposition, and such manufacturing processes are complicated and costly.
Therefore, the related art illumination apparatus 10 of FIG. 1 incurs high manufacturing costs and is limited in terms of light use efficiency.
Method used
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[0032]FIG. 3 illustrates a structure of a polarization separating film 30 according to an exemplary embodiment of the present invention and an illumination apparatus 20 for a display device using the polarization separating film 30, according to an exemplary embodiment of the present invention. Referring to FIG. 3, the illumination apparatus 20 for a display device includes a light source 22 emitting light; a light guide plate 21, having an incident surface 21a on which the light emitted from the light source 22 is incident, an opposite surface 21b facing the incident light surface 21a, and an upper surface 21c from which light exits; and the polarization separating film 30, arranged to face the upper surface 21c of the light guide plate 21.
[0033]According to an exemplary embodiment, the light guide plate 21 is a wedge type light guide plate and has a lower surface 21d inclined such that the thickness of the light guide plate 21 decreases from the incident surface 21a toward the opp...
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A polarization separating film is provided, including an isotropic layer having a refractive index which is the same with respect to light having a first polarization and with respect to light having a second polarization, perpendicular to the first polarization; an anisotropic layer disposed on an upper surface of the isotropic layer and having a first refractive index with respect to light having the first polarization and a second refractive index, different from the first refractive index, with respect to light having the second polarization; a first micropattern disposed on a lower surface of the isotropic layer which changes an optical path of incident light; and a second micropattern, disposed on an interface between the isotropic layer and the anisotropic layer, which totally reflects light having the first polarization and which transmits light having the second polarization.
Description
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS[0001]This application claims priority from Korean Patent Application No. 10-2006-0107488, filed on Nov. 1, 2006, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]Apparatuses consistent with the present invention relate to a polarization separating film and an illumination apparatus for a display device using the polarization separating film, and more particularly, to a polarization separating film capable of transmitting only light in a particular polarization direction from light emitted from a light guide plate and simultaneously guiding the light emitted from the light guide plate along a normal direction, and an illumination apparatus for a display device using the polarization separating film.[0004]2. Description of the Related Art[0005]Display devices are classified as emissive types which form an ...
Claims
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IPC IPC(8): G02B5/30
CPCG02B5/305G02B6/0053G02F2001/133607G02F1/133615G02F1/13362G02B27/285G02F1/133607G02F1/1335
InventorHWANG, SEONG-MOWEE, DONG-HONAM, SEUNG-HO
OwnerSAMSUNG ELECTRONICS CO LTD